<svg xmlns="http://www.w3.org/2000/svg" version="1.1"
     xmlns:xlink="http://www.w3.org/1999/xlink">
  <title>Testing invalid values for |viewBox| attributes</title>
  <defs>
    <rect id="redRect"  fill="red"  height="10" width="10"/>
    <rect id="limeRect" fill="lime" height="10" width="10"/>
  </defs>
  <rect fill="lime" height="100%" width="100%"/>

  <g transform="translate(0, 0)">
    <use xlink:href="#redRect"/>
    <!-- negative width/height in viewBox should ignore entire attribute -->
    <svg width="20" height="20" viewBox="0,0,0,-1">
      <use xlink:href="#limeRect"/>
    </svg>
  </g>
  <g transform="translate(20, 0)">
    <use xlink:href="#redRect"/>
    <!-- negative width/height in viewBox should ignore entire attribute -->
    <svg width="20" height="20" viewBox="0,0,-1,0">
      <use xlink:href="#limeRect"/>
    </svg>
  </g>
  <g transform="translate(40, 0)">
    <use xlink:href="#limeRect"/>
    <!-- zero width/height in viewBox should render nothing -->
    <svg width="20" height="20" viewBox="0,0,0,20">
      <use xlink:href="#redRect"/>
    </svg>
  </g>
  <g transform="translate(60, 0)">
    <use xlink:href="#limeRect"/>
    <!-- zero width/height in viewBox should render nothing -->
    <svg width="20" height="20" viewBox="0,0,20,0">
      <use xlink:href="#redRect"/>
    </svg>
  </g>
</svg>
